A5002146140- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Particle accelerators and beam dynamics
- HVDC Systems and Fault Protection
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Spacecraft and Cryogenic Technologies
- Iron-based superconductors research
- Atomic and Subatomic Physics Research
- Superconductivity in MgB2 and Alloys
- Antibiotic Use and Resistance
- Intellectual Capital and Performance Analysis
- Solar and Space Plasma Dynamics
- Vibrio bacteria research studies
- Antibiotic Resistance in Bacteria
- Corporate Taxation and Avoidance
Lawrence Berkeley National Laboratory
2020-2024
The Ohio State University
2005-2020
Ohio State University Hospital
2005
Abstract Although the high-temperature superconducting (HTS) REBa 2 Cu 3 O x (REBCO, RE–rare earth elements) material has a strong potential to enable dipole magnetic fields above 20 T in future circular particle colliders, magnet and conductor technology needs be developed. As part of an ongoing development address this need, here we report on our CORC ® canted cos θ called C2 with target field 65 mm aperture. The was wound 70 m 3.8 diameter wire machined metal mandrels. had 30 commercial...
As part of the US Magnet Development Program, Lawrence Berkeley National Laboratory (LBNL) is working on development high field stress-managed Nb <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$_{3}$</tex-math></inline-formula> Sn dipole magnets using canted-cosine-theta (CCT) technology. this program, a series two layer magnets, CCT3/4/5, with short sample bore approximately 10 T and 90 mm diameter open...
The use of high-field superconducting magnets has furthered the development medical diagnosis, fusion research, accelerators, and particle physics. High-temperature superconductors enable more powerful than those possible with Nb-Ti (superconducting transition temperature ${T}_{c}$ 9.2 K) ${\mathrm{Nb}}_{3}\mathrm{Sn}$ (${T}_{c}$ 18.4 conductors due to their very high critical field ${B}_{c2}$ greater 100 T near 4.2 K. However, accelerator using high-temperature is still at its early stage....
High-temperature-superconducting (HTS) cables are being considered for use in particle accelerator beam steering magnets. Knowledge of the magnetic properties these HTS is needed magnet design. Here, we present results from a Hall probe magnetometer made measuring M-μ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> H short sections superconducting applied fields up to 12 T. The CORC cable was measured with field sweeps ± 4.5 T and also...
Abstract Future high energy physics colliders could benefit from accelerator magnets based on high-temperature superconductors, which may reach magnetic fields of up to 45 T at 4.2 K, twice the field limit two Nb-based superconductors. Bi 2 Sr CaCu O 8-x (Bi-2212) is only high- c cuprate material available as a twisted, multifilamentary and isotropic round wire. However, it has been hitherto unclear how an magnet can be fabricated Bi-2212 wires whether quality achieved. This paper reports...
Suppression of magnetization and effective filament diameter deff with twisting was investigated for a series recent Bi2212 strands manufactured by Oxford Superconducting Technologies. We measured as function field (out to 14 T), at 5.1 K, twisted nontwisted 37 × 18 double restack design strands. The samples were helical coils 5-6 mm in height approximately 5 diameter. strand 0.8 mm. having twist pitches 25.4, 12.7, 6.35 examined compared the same configuration. critical state model used...
High-temperature superconductors (HTSs), including YBCO coated conductors, are being considered for high field dipole and quadrupole magnets future particle accelerators. The quality of the magnetic generated by magnet its temporal stability important considerations. persistent current magnetization can degrade made from them causing error fields, flux creep in superconductor may lead to drift value during ramp holding sequences, at injection. HTS composites possess larger magnetizations...
Bi-2212 superconducting cables are being considered for use in the high field magnets needed next generation of particle accelerators. Magnetization these and decay that magnetization lead to error field-error drift, respectively, which need be compensated. To study this, a segment winding pack was extracted from racetrack coil made Rutherford cable. Using Hall probe measurement technique, we measured response cable's its changes applied magnetic field. The effect adjustments cycling...
Abstract A dipole magnet generating 20 T and beyond will require high-temperature superconductors such as Bi 2 Sr CaCu O <?CDATA $_{8-x}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi /> <mml:mrow> <mml:mn>8</mml:mn> <mml:mo>−</mml:mo> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:math> REBa Cu 3 $_{7-x}$?> <mml:mn>7</mml:mn> (RE = rare earth, rebco ). Symmetric tape round ( star ®) wires based on tapes are emerging a potential conductor...
In this work, pulse calorimetry was used to measure the specihc heats of four superconducting materials at temperatures from 0 300 K and in magnetic helds 14 T. Specihc heat measurements were performed on Bi2212 round wire samples with a two-dimensional random oriented single stack design, made by Supramagnetics Inc., conventional design Oxford Superconductor. also copper-stabilized MgB2 sample rod-in-tube type Nb3Sn Hyper Tech Research, which subject their appropriate treatments. All...
In this work, a new strand design for Bi-2212 conductors was studied. The had single stack approach with randomly oriented but densely packed two-dimensional filaments. This Two-Dimensional Random-Oriented Single-Stack (2D-ROSS) Round Wire led to high levels of grain texture and significant amounts Ag-superconductor interface within the filaments, while maintaining fill factor. compared made conventional billet layout. Heat treatments were performed under 100% flowing oxygen, samples melt...
Conventional methods of Ba <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.6</sub> K xmlns:xlink="http://www.w3.org/1999/xlink">0.4</sub> Fe xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> As precursor preparation are complicated and expensive. In this paper, we describe the mechanical alloying by high-energy ball milling its processing to wires tapes. Our approach is ball-mill a starting mixture pieces with powders. The resultant powders...
In accelerator magnets the magnetic field quality is an important parameter. Using REBCO tapes or cables in magnet windings affects because of a quite high magnetization generated by these conductors. this paper we analyzed numerically (using FEM) effect various cables' on canted cosine theta (CCT) dipole magnets. The properties were taken from our measurements their M (H) curves at 4.2 K and fields up to 12 T. Also, flux creep effects measured analyzed. Here present modeling CCT containing...
This paper presents the results of FEM analysis effect REBCO CORC cable magnetization on field quality a canted cosine theta (CCT) dipole magnet. The magnetic properties were our measurements its <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">M</i> ( xmlns:xlink="http://www.w3.org/1999/xlink">H</i> ) curves at 4.2 K and fields up to 8 T. data was used calculate error for CCT experimental magnet developed by LBNL. experiment compared. To make...
The U.S. High-Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP) is developing MQXFA magnets, a series of 4.5 m long 150 mm aperture high-field Nb <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$_{3}$</tex-math></inline-formula> Sn quadrupole magnets for the HL-LHC upgrade at CERN. Five pre-series MQXFA03 through MQXFA07, have been developed. During magnet assembly stage, we perform magnetic...
High temperature superconductors, including Bi:2212, are being considered for high magnetic field magnets to be used in particle accelerators. A knowledge of HTS magnetization properties needed calculating errors such accelerator magnets. Here we present measurements a 17 strand Bi:2212 Rutherford cable. The was Bruker OST PMM170123 non-twisted wire wound into cable with dimensions 1.46 mm x 7.8 and pitch 50.8 mm. M-H loop were made Hall probe at 4.2 K. Two calibration methods compared, (i)...
SmFeAsO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</sub> F xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> type oxypnictide bulks were made via a single-step synthesis. Polycrystalline bulk samples with nominal composition (x=0.35 and 0.4) synthesized by conventional solid state reaction using the starting powders SmF xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> , Sm, Fe, Fe xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O...
The magnetizations of eight high-gradient quadrupole cables designated HQ and QXF a pair strands, identical in architecture but with different effective strand diameters extracted from an related cable, were measured. In the service field quality assessment, cable losses measured by pickup coil magnetometry at 4.2 K face-on fields, Bm, ± 400 mT frequencies, f, up to 60 mHz. Based on coupling component loss, Qcoup, magnetization Mcoup = Qcoup/4Bm was derived for ramp rate 7.5 mT/s. Persistent...